Principle of the dynamic neutral electrode in high frequency cutting
Reidenbach, H.D.
Biomedizinische Technik. Biomedical Engineering 33(11): 266-270
1988
ISSN/ISBN: 0013-5585 PMID: 3207817 Document Number: 316597
The monopolar high-frequency cutting technique requires the use of a relatively large neutral electrode. Although burning may be virtually avoided by correct application, method-related problems nevertheless remain. In this respect the bipolar technique represents a suitable and safer method. Since pure bipolar high-frequency cutting is unsatisfactory in practice, a quasi-bipolar concept in which a dynaic neutral electrode is employed was investigated. The indifferent electrode glides simultaneously with the cutting electrode over the tissue, thus restricting high-frequency-induced effects to the immediate vicinity of the active cutting electrode. The area necessary for a dynamic neutral electrode is calculated as a function of cutting velocity or duration of application. Experimental results are presented for different electrode arrangements, such as needle-ball, needle-ring and needle-double ball, the principle of electrohydrothermosation (EHT) simultaneously being taken into account. The quasi-bipolar high-frequency cutting-method can be applied in practice.